JPS6127091A - High frequency heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high-frequency heating device for high-frequency heating and cooking of foods and the like using high-frequency radio waves.

Construction of conventional examples and their problems Most conventional heating devices of this type have used a magnetron as a high-frequency heating heat source. This magnetron requires a high voltage of several thousand volts as a drive power source, so it requires high-voltage parts such as a large and heavy step-up transformer and high-voltage capacitor to generate high voltage. This was a major bottleneck in measurement.

Furthermore, since the magnetron is an electron tube type oscillator, its lifespan was generally estimated to be several thousand hours.

In contrast, with the remarkable progress of the semiconductor industry in recent years,
Even in the microwave region, the amount of power that a single semiconductor element can handle has progressed dramatically, and it has become possible to construct a high-frequency heating heat source using hundreds of elements.

Although this semiconductor element has features not available in conventional magnetrons, such as being able to be driven at a low voltage of 100 V or less and having a semi-permanent life, it has the disadvantage of being thermally weak.

In order to solidify a high-frequency heating heat source, in addition to generating an absolute power of several hundred watts, it is also necessary to efficiently dissipate the heat loss that occurs in order to obtain this output to prevent thermal destruction of semiconductor elements. Developing a mechanism design to prevent this from happening is an important issue.

Purpose of the Invention The present invention has been made in view of this point, and has devised a heat dissipation mechanism of a solidified high-frequency heating heat source installed in a high-frequency heating device, thereby providing a compact and highly reliable high-frequency heating device. It provides:

Structure of the Invention To achieve the above-mentioned object, the present invention provides a method of installing a heat dissipation fin and a cooling fan so as to directly blow cooling air over the entire area of the heat dissipation fin, which is a heat dissipation means attached to a solid high frequency generation unit that is a high frequency heating heat source. This has been achieved by configuring the layout.

Description of examples Below, I will explain the misfired man with reference to the drawings.

FIG. 1 is a front sectional view of a high-frequency heating device showing an embodiment of the present invention.

A large high-frequency wave generated by the solid-state high-frequency generator 1 is transmitted through a coaxial transmission line 2 to a heated object (not shown).
Electric power is supplied to the heating chamber by a power feeding antenna 5 disposed at a predetermined position on the upper wall surface 4 of the heating chamber 3 housing the heating chamber 3, and the object to be heated is heated by high frequency.

Here, a radiation fin 6 is attached to the lower part of the solid-state high-frequency generator 1 to which heat loss generated by the component parts of the solid-state high-frequency generator is transferred.

The radiation fins are disposed substantially parallel to the upper wall surface 4 of the heating chamber, and a solid high frequency generating section is disposed in the space created by the upper wall surface of the heating chamber and the main body 7. On the other hand, the fin portion of the radiation fin is disposed below the extension of the upper wall of the heating chamber. Further, a cooling fan 8 is provided below the fins so as to blow cooling air directly over the entire area of the radiation fins. The arrows indicate the intake and exhaust passages for the overflow air.

FIG. 2 is a right side sectional view of FIG. Parts that are the same as in FIG. 1 are designated by the same numbers. In addition, the cooling air intake and exhaust passages are indicated by arrows.

An embodiment of the present invention has a configuration in which two propeller fans are arranged in parallel as cooling fans to blow cooling air over the entire area of the radiation fins 6.

Further, the intake and exhaust passages are separated using a fixing plate 9 that fixes the cooling fan. A drive power transformer 10 of the solid-state high frequency generator 1 is arranged in this intake passage. 1
Reference numeral 1 denotes an access door that constitutes one wall of the heating chamber used when the object to be heated is taken in and out of the heating chamber.

FIG. 3 is a side sectional view of a high frequency heating device showing another embodiment of the present invention.

Parts that are the same as in FIG. 2 are designated by the same numbers.

In this configuration, a cross flow fan 12 is used as a cooling fan.

When using a crossflow fan to cool radiating fins,
A configuration in which cooling air is blown from the side of the radiation fins is common. However, when configuring a heat dissipation system for a heat source that outputs high power, such as a high-frequency heating heat source, the heat dissipation is large, so the arrangement is similar to that of a propeller fan, that is, the present invention blows cooling air directly over the entire area of the heat dissipation fins. This arrangement has good heat dissipation efficiency, and furthermore, the space inside the device can be used effectively, contributing to the compactness of the device.

In addition to the effects of the invention, the present invention provides a high-frequency heating device in which radiation fins and a cooling fan are arranged so as to directly blow cooling air over the entire fin portion of the radiation fins attached to a solid-state high-frequency generator that is a high-frequency heating heat source. It provides the following effects.

(1) Since cooling air is blown directly over the entire area of the radiation fins, the heat radiation efficiency can be increased and a highly reliable solid-state frequency generator can be configured.

(2) Since the cooling fan and the driving electric unit can be integrated on one wall side of the heating chamber, it is easy to increase the volume ratio of the heating chamber to the main body of the apparatus. In other words, the main body of the apparatus can be configured compactly with respect to the volume of the heating chamber.

[Brief Description of the Drawings] Fig. 1 is a front cross-sectional view of a high-frequency heating device showing one embodiment of the present invention, Fig. 2 is a right side cross-sectional view of Fig. 1, and Fig. 3 is another embodiment of the present invention. FIG. 2 is a side cross-sectional view of the high-frequency heating device. 1...Solid high frequency generation part, 3...Heating chamber, 4...Top wall surface of heating chamber, 6...Radiating fin (heat radiating means), 8.12 ·····cooling fan.

Claims (1)

[Claims] a heating chamber in which an object to be heated is accommodated; a solid-state high-frequency generator that is a high-frequency heating heat source; and a solid-state high-frequency generator placed approximately parallel to the upper wall surface of the heating chamber and installed in the solid-state high-frequency generator. 1. A high-frequency heating device comprising: a heat radiating means for dissipating heat loss from a part of the body; and a cooling fan disposed below the heat radiating means for cooling the heat radiating means.